JohnsonOutboardModelFromSerialNumberUsed Johnson Boat Motors e. Play Dinosaur King Card Games. Johnson Outboards was a US based manufacturer of outboard motors. History. The original company to make Johnson inboard motors and outboard motors was the Johnson. Johnson Serial Numbers Johnson has changed how they indicate year in the model number several times. Depending on the year range your motor falls into, you will find. Johnson Evinrude Outboard Engine parts direct replacement starters, alternators, water pumps and other Johnson Evinrude boat parts at Go2marine. OMC Engines and Outdrive. The model and serial numbers of the vertical drive should be located on the engine model and serial number plate. If the vertical drive. Find great deals on eBay for 20 HP Outboard Motor in Complete Outboard Engines. Shop with confidence.